6438788685 has 64 divisors (see below), whose sum is σ = 13770547200. Its totient is φ = 2788520256.

The previous prime is 6438788651. The next prime is 6438788717. The reversal of 6438788685 is 5868878346.

It is not a de Polignac number, because 6438788685 - 2¹⁶ = 6438723149 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 161349 + ... + 197258.

It is an arithmetic number, because the mean of its divisors is an integer number (215164800).

Almost surely, 2^6438788685 is an apocalyptic number.

It is an amenable number.

6438788685 is an abundant number, since it is smaller than the sum of its proper divisors (7331758515).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6438788685 is a wasteful number, since it uses less digits than its factorization.

6438788685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358647 (or 358641 counting only the distinct ones).

The product of its digits is 61931520, while the sum is 63.

The square root of 6438788685 is about 80242.0630654521. The cubic root of 6438788685 is about 1860.3788380269.

The spelling of 6438788685 in words is "six billion, four hundred thirty-eight million, seven hundred eighty-eight thousand, six hundred eighty-five".